490 Mr. E. A. Smith's Diagnoses of 



infra modlum contractus, tarinis 12-] 3 et inter has striis spini- 

 libus cxilibus ornatus ; a])ertufa parva, hasi angustata, longi- 

 tudinis testa? g fere a^qxians, intus hris intrantibus 4-5 munita ; 

 labruni tonne, medio proiuinens, supra carinam maximam tissura 

 latiuscula sed hand profunde incisum ; cohimella leviter sinuata, 

 callo teuuissimo induta : cauahs mediociiter brevis, vix recurvus. 

 Long, 22 mill., diam. fere 7. 



Hah, — ? 



It is with considerable hesitation that 1 aj)ply a name to 

 tliis form, on account of its close relationshipwith/?/7>a^a, Hinds. 

 The chief differences are the narrower form, larger tubercles, 

 and shorter canal, in the latter character bearing the same rela- 

 tion to Jiibaf a as cinguUfera (Lamarck) does to his alhina. 



Pleurotoma retuslspirata. 

 Testa elongato-subfusiformis, dilute pnrpurascens, ad* apicem ob- 

 tusum satiu-atior ; ant'ract. 8, primi 2 (nucleus) vitrei, politi, 

 globosi, sequentes 5 bicarinati (carina superiore duplici) hraque 

 intercurrente nodosa cincti, inter carinas liris lougitudinalibus 

 eonfertis, tenuibus ornati, sutura canaliculata discreti ; anfr. ulti- 

 rans ad peripheriam rotundatus, deinde contractus caudam brevem 

 formans, carinis ad 12 suba;qualibus suceinctus; apertura parva, 

 longitudinis testae 5 paulo superans, iutus sulcata, sulcis costis 

 extcrnis respondentibus ; labrum margine levissime incrassatum 

 et crcnulatum, paululum supra medium fissura parva incisum ; 

 columella medio plicis duabus minutis (superiore fere obsoleta) 

 munita, ad basim dextrorsum curvata ac infra labrum descendens ; 

 caualis brevis, recui-vus. 

 Long. 7| miU., diam. 2i. 



Hob. ? 



The present species has for its nearest relative P. violaceaj 

 Hinds, from which it differs in form somewhat ; the apex is 

 blunter ; and there is but a single nodose liration around the 

 middle of each whorl, whereas Hinds's species possesses two. 



Pleurotoma cognata. 



Testa elongato-subfusiformis, luteo-albida, versus ajjicem dilute 

 purpurea, carinis albis cincta, et inter carinas striis tt-nuibus longi- 

 tudinaliter insculpta ; spira pcrelongata, acuta, lateribus rcctis ; 

 anfract. 12?, sutura carinata sejuncti ; primi 4? (abrapti), 

 sequentes 7 medio concavi, carinis duabus validis, remotis, et inter 

 carinas liris 2 exilibus, cincti ; aiifr. ultimus basi contractus, 

 caudam brevem formans, carinis ad 12 (quarura superiorcs 3 max- 

 imse) cinctus ; apertura alba, angusta, basi paululum contractu, 

 longitudinis testte ^ sequans ; fissura minime profunda, inter 

 carinas primam secundamque sita ; labrum tenue, margine cre- 

 nulatum ; columella medio obsolete uniplicata ; canalis brevis, 

 obhquus, leviter reflexus. 



Long. 24 miU., diam. 7. 



